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using System;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace System.Windows.Forms {
internal class MdiChildContext {
private static readonly int MdiBorderStyle = 0xFFFF;
private static Color titlebar_color;
private MainMenu merged_menu;
private int BorderWidth = 3;
// private int TitleBarHeight = 26;
// private int ToolTitleBarHeight = 19;
private Size MinTitleBarSize = new Size (115, 25);
private Form form;
private MdiClient mdi_container;
private TitleButton close_button;
private TitleButton maximize_button;
private TitleButton minimize_button;
private TitleButton [] title_buttons = new TitleButton [3];
// moving windows
private Point start;
private State state;
private FormPos sizing_edge;
private Rectangle virtual_position;
private Rectangle prev_virtual_position;
private Rectangle prev_bounds;
private bool maximized;
private class TitleButton {
public Rectangle Rectangle;
public ButtonState State;
public CaptionButton Caption;
public EventHandler Clicked;
public TitleButton (CaptionButton caption, EventHandler clicked)
{
Caption = caption;
Clicked = clicked;
}
}
private enum State {
Idle,
Moving,
Sizing,
}
[Flags]
private enum FormPos {
None,
TitleBar = 1,
Top = 2,
Left = 4,
Right = 8,
Bottom = 16,
TopLeft = Top | Left,
TopRight = Top | Right,
BottomLeft = Bottom | Left,
BottomRight = Bottom | Right,
AnyEdge = Top | Left | Right | Bottom,
}
public MdiChildContext (Form form, MdiClient mdi_container)
{
titlebar_color = Color.FromArgb (255, 0, 0, 255);
this.form = form;
this.mdi_container = mdi_container;
/*
minimize_button = new Button ();
minimize_button.Bounds = new Rectangle (form.Width - 62,
-26, 18, 22);
minimize_button.Anchor = AnchorStyles.Top | AnchorStyles.Right;
minimize_button.Paint += new PaintEventHandler (PaintButtonHandler);
minimize_button.Click += new EventHandler (OnMinimizeHandler);
maximize_button = new Button ();
maximize_button.Bounds = new Rectangle (form.Width - 44,
BorderWidth + 2, 18, 22);
maximize_button.Anchor = AnchorStyles.Top | AnchorStyles.Right;
maximize_button.Paint += new PaintEventHandler (PaintButtonHandler);
maximize_button.Click += new EventHandler (OnMaximizeHandler);
close_button = new Button ();
close_button.Bounds = new Rectangle (form.Width - 24,
BorderWidth + 2, 18, 22);
close_button.Anchor = AnchorStyles.Top | AnchorStyles.Right;
close_button.Paint += new PaintEventHandler (PaintButtonHandler);
close_button.Click += new EventHandler (CloseButtonClicked);
form.Controls.AddImplicit (close_button);
form.Controls.AddImplicit (maximize_button);
form.Controls.AddImplicit (minimize_button);
*/
CreateButtons ();
}
public bool Maximized {
get { return maximized; }
}
public MainMenu MergedMenu {
get {
if (merged_menu == null)
merged_menu = CreateMergedMenu ();
return merged_menu;
}
}
private MainMenu CreateMergedMenu ()
{
Form parent = (Form) mdi_container.Parent;
MainMenu clone = (MainMenu) parent.Menu.CloneMenu ();
clone.MergeMenu (form.Menu);
clone.MenuChanged += new EventHandler (MenuChangedHandler);
clone.SetForm (parent);
return clone;
}
private void MenuChangedHandler (object sender, EventArgs e)
{
CreateMergedMenu ();
}
public bool HandleMessage (ref Message m)
{
switch ((Msg)m.Msg) {
// The mouse handling messages are actually
// not WM_NC* messages except for the first button and NCMOVEs
// down because we capture on the form
case Msg.WM_MOUSEMOVE:
return HandleMouseMove (form, ref m);
case Msg.WM_LBUTTONUP:
HandleLButtonUp (ref m);
break;
case Msg.WM_RBUTTONDOWN:
case Msg.WM_LBUTTONDOWN:
return HandleButtonDown (ref m);
case Msg.WM_NCMOUSEMOVE:
return HandleNCMouseMove (form, ref m);
case Msg.WM_NCLBUTTONUP:
return HandleNCLButtonUp (ref m);
case Msg.WM_NCLBUTTONDOWN:
return HandleNCLButtonDown (ref m);
case Msg.WM_MOUSE_LEAVE:
FormMouseLeave (ref m);
break;
case Msg.WM_NCPAINT:
// form.UpdateStyles ();
PaintWindowDecorations ();
// Graphics g = XplatUI.GetMenuDC (form.Handle, IntPtr.Zero);
// g.Clear (Color.Red);
break;
}
return false;
}
public void UpdateBorderStyle (FormBorderStyle border_style)
{
if (border_style != FormBorderStyle.None)
XplatUI.SetBorderStyle (form.Handle, (FormBorderStyle) MdiBorderStyle);
else
XplatUI.SetBorderStyle (form.Handle, FormBorderStyle.None);
CreateButtons ();
}
private void CreateButtons ()
{
switch (form.FormBorderStyle) {
case FormBorderStyle.None:
close_button = null;
minimize_button = null;
maximize_button = null;
break;
case FormBorderStyle.FixedSingle:
case FormBorderStyle.Fixed3D:
case FormBorderStyle.FixedDialog:
case FormBorderStyle.Sizable:
close_button = new TitleButton (CaptionButton.Close, new EventHandler (CloseClicked));
minimize_button = new TitleButton (CaptionButton.Minimize, new EventHandler (MinimizeClicked));
maximize_button = new TitleButton (CaptionButton.Maximize, new EventHandler (MaximizeClicked));
break;
case FormBorderStyle.FixedToolWindow:
case FormBorderStyle.SizableToolWindow:
close_button = new TitleButton (CaptionButton.Close, new EventHandler (CloseClicked));
break;
}
title_buttons [0] = close_button;
title_buttons [1] = minimize_button;
title_buttons [2] = maximize_button;
}
private bool HandleButtonDown (ref Message m)
{
form.BringToFront ();
mdi_container.ActiveMdiChild = form;
return false;
}
private bool HandleNCLButtonDown (ref Message m)
{
form.BringToFront ();
mdi_container.ActiveMdiChild = form;
int x = Control.LowOrder ((int) m.LParam.ToInt32 ());
int y = Control.HighOrder ((int) m.LParam.ToInt32 ());
form.PointToClient (ref x, ref y);
start = new Point (x, y);
virtual_position = form.Bounds;
// Need to adjust because we are in NC land
y += TitleBarHeight;
FormPos pos = FormPosForCoords (x, y);
if (pos == FormPos.TitleBar) {
HandleTitleBarDown (x, y);
return true;
}
if (IsSizable) {
SetCursorForPos (pos);
if ((pos & FormPos.AnyEdge) == 0)
return false;
state = State.Sizing;
sizing_edge = pos;
form.Capture = true;
return true;
}
return false;
}
private void HandleTitleBarDown (int x, int y)
{
foreach (TitleButton button in title_buttons) {
if (button != null && button.Rectangle.Contains (x, y)) {
button.State = ButtonState.Pushed;
return;
}
}
if (maximized)
return;
state = State.Moving;
form.Capture = true;
}
private bool HandleMouseMove (Form form, ref Message m)
{
switch (state) {
case State.Moving:
HandleWindowMove (m);
return true;
case State.Sizing:
HandleSizing (m);
return true;
}
/*
if (IsSizable) {
int x = Control.LowOrder ((int) m.LParam.ToInt32 ());
int y = Control.HighOrder ((int) m.LParam.ToInt32 ());
FormPos pos = FormPosForCoords (x, y);
Console.WriteLine ("position: " + pos);
SetCursorForPos (pos);
ClearVirtualPosition ();
state = State.Idle;
}
*/
return false;
}
private bool HandleNCMouseMove (Form form, ref Message m)
{
if (IsSizable) {
int x = Control.LowOrder ((int) m.LParam.ToInt32 ());
int y = Control.HighOrder ((int) m.LParam.ToInt32 ());
FormPos pos = FormPosForCoords (x, y);
SetCursorForPos (pos);
ClearVirtualPosition ();
state = State.Idle;
}
return false;
}
private void FormMouseLeave (ref Message m)
{
form.ResetCursor ();
}
private void SetCursorForPos (FormPos pos)
{
switch (pos) {
case FormPos.TopLeft:
case FormPos.BottomRight:
form.Cursor = Cursors.SizeNWSE;
break;
case FormPos.TopRight:
case FormPos.BottomLeft:
form.Cursor = Cursors.SizeNESW;
break;
case FormPos.Top:
case FormPos.Bottom:
form.Cursor = Cursors.SizeNS;
break;
case FormPos.Left:
case FormPos.Right:
form.Cursor = Cursors.SizeWE;
break;
default:
form.ResetCursor ();
break;
}
}
private void HandleWindowMove (Message m)
{
Point move = MouseMove (m);
virtual_position.X = form.Left + move.X;
virtual_position.Y = form.Top + move.Y;
virtual_position.Width = form.Width;
virtual_position.Height = form.Height;
mdi_container.EnsureScrollBars (virtual_position.Right, virtual_position.Bottom);
DrawVirtualPosition ();
}
private void HandleSizing (Message m)
{
Point move = MouseMove (m);
Rectangle pos = virtual_position;
int mw = MinTitleBarSize.Width + (BorderWidth * 2);
int mh = MinTitleBarSize.Height + (BorderWidth * 2);
if ((sizing_edge & FormPos.Top) != 0) {
int height = form.Height - move.Y;
if (height <= mh) {
move.Y += height - mh;
height = mh;
}
pos.Y = form.Top + move.Y;
pos.Height = height;
} else if ((sizing_edge & FormPos.Bottom) != 0) {
int height = form.Height + move.Y;
if (height <= mh)
move.Y -= height - mh;
pos.Height = form.Height + move.Y;
}
if ((sizing_edge & FormPos.Left) != 0) {
int width = form.Width - move.X;
if (width <= mw) {
move.X += width - mw;
width = mw;
}
pos.X = form.Left + move.X;
pos.Width = width;
} else if ((sizing_edge & FormPos.Right) != 0) {
int width = form.Width + move.X;
if (width <= mw)
move.X -= width - mw;
pos.Width = form.Width + move.X;
}
UpdateVP (pos);
}
private bool IsSizable {
get {
switch (form.FormBorderStyle) {
case FormBorderStyle.Sizable:
case FormBorderStyle.SizableToolWindow:
return true;
default:
return false;
}
}
}
private bool HasBorders {
get {
return form.FormBorderStyle != FormBorderStyle.None;
}
}
private bool IsToolWindow {
get {
if (form.FormBorderStyle == FormBorderStyle.SizableToolWindow ||
form.FormBorderStyle == FormBorderStyle.FixedToolWindow)
return true;
return false;
}
}
private int TitleBarHeight {
get {
if (IsToolWindow)
return 19;
if (form.FormBorderStyle == FormBorderStyle.None)
return 0;
return 26;
}
}
private void UpdateVP (Rectangle r)
{
UpdateVP (r.X, r.Y, r.Width, r.Height);
}
private void UpdateVP (Point loc, int w, int h)
{
UpdateVP (loc.X, loc.Y, w, h);
}
private void UpdateVP (int x, int y, int w, int h)
{
virtual_position.X = x;
virtual_position.Y = y;
virtual_position.Width = w;
virtual_position.Height = h;
DrawVirtualPosition ();
}
private void HandleLButtonUp (ref Message m)
{
if (state == State.Idle)
return;
ClearVirtualPosition ();
form.Capture = false;
form.Bounds = virtual_position;
state = State.Idle;
}
private bool HandleNCLButtonUp (ref Message m)
{
int x = Control.LowOrder ((int) m.LParam.ToInt32 ());
int y = Control.HighOrder ((int) m.LParam.ToInt32 ());
form.PointToClient (ref x, ref y);
// Need to adjust because we are in NC land
y += TitleBarHeight;
foreach (TitleButton button in title_buttons) {
if (button != null && button.Rectangle.Contains (x, y)) {
button.Clicked (this, EventArgs.Empty);
return true;
}
}
return true;
}
private void PaintWindowDecorations ()
{
Graphics dc = XplatUI.GetMenuDC (form.Handle, IntPtr.Zero);
if (HasBorders) {
Rectangle borders = new Rectangle (0, 0, form.Width, form.Height);
// dc.FillRectangle (new SolidBrush (Color.Black), borders);
/*
dc.DrawRectangle (new Pen (SystemColors.ControlLight, 1), borders);
borders.Inflate (-2, -2);
dc.DrawRectangle (new Pen (SystemColors.ControlDark, 1), borders);
borders.X++;
borders.Width -= 2;
dc.DrawRectangle (new Pen (SystemColors.ControlLight, 1), borders);
*/
ControlPaint.DrawBorder3D (dc, borders, Border3DStyle.Raised);
if (IsSizable) {
borders.Inflate (-1, -1);
ControlPaint.DrawFocusRectangle (dc, borders);
}
}
Color color = ThemeEngine.Current.ColorControlDark;
if (form == mdi_container.ActiveMdiChild && !maximized)
color = titlebar_color;
Rectangle tb = new Rectangle (BorderWidth, BorderWidth,
form.Width - (BorderWidth * 2), TitleBarHeight - 1);
dc.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (color), tb);
dc.DrawLine (new Pen (Color.White, 1), BorderWidth,
TitleBarHeight + BorderWidth, form.Width - BorderWidth,
TitleBarHeight + BorderWidth);
if (!IsToolWindow) {
tb.X += 18; // Room for the icon and the buttons
tb.Width = (form.Width - 62) - tb.X;
}
if (form.Text != null) {
StringFormat format = new StringFormat ();
format.FormatFlags = StringFormatFlags.NoWrap;
format.Trimming = StringTrimming.EllipsisCharacter;
format.LineAlignment = StringAlignment.Center;
dc.DrawString (form.Text, form.Font,
ThemeEngine.Current.ResPool.GetSolidBrush (Color.White),
tb, format);
}
if (!IsToolWindow && HasBorders) {
if (form.Icon != null) {
dc.DrawIcon (form.Icon, new Rectangle (BorderWidth + 3,
BorderWidth + 3, 16, 16));
}
minimize_button.Rectangle = new Rectangle (form.Width - 62,
BorderWidth + 2, 18, 22);
maximize_button.Rectangle = new Rectangle (form.Width - 44,
BorderWidth + 2, 18, 22);
close_button.Rectangle = new Rectangle (form.Width - 24,
BorderWidth + 2, 18, 22);
DrawTitleButton (dc, minimize_button);
DrawTitleButton (dc, maximize_button);
DrawTitleButton (dc, close_button);
} else {
close_button.Rectangle = new Rectangle (form.Width - BorderWidth - 2 - 13,
BorderWidth + 2, 13, 13);
DrawTitleButton (dc, close_button);
}
}
private void DrawTitleButton (Graphics dc, TitleButton button)
{
dc.FillRectangle (SystemBrushes.Control, button.Rectangle);
ControlPaint.DrawCaptionButton (dc, button.Rectangle,
button.Caption, ButtonState.Normal);
}
private void CloseClicked (object sender, EventArgs e)
{
form.Close ();
// form.Close should set visibility to false somewhere
// in it's closing chain but currently does not.
form.Visible = false;
}
private void MinimizeClicked (object sender, EventArgs e)
{
form.SuspendLayout ();
form.Width = MinTitleBarSize.Width + (BorderWidth * 2);
form.Height = MinTitleBarSize.Height + (BorderWidth * 2);
form.ResumeLayout ();
}
private void MaximizeClicked (object sender, EventArgs e)
{
if (maximized) {
form.Bounds = prev_bounds;
maximized = false;
} else {
prev_bounds = form.Bounds;
form.Bounds = form.Parent.Bounds;
maximized = true;
}
}
private Point NewLocation (Message m)
{
int x = Control.LowOrder ((int) m.LParam.ToInt32 ());
int y = Control.HighOrder ((int) m.LParam.ToInt32 ());
int x_move = x - start.X;
int y_move = y - start.Y;
return new Point (form.Left + x_move, form.Top + y_move);
}
private Point MouseMove (Message m)
{
int x = Control.LowOrder ((int) m.LParam.ToInt32 ());
int y = Control.HighOrder ((int) m.LParam.ToInt32 ());
int x_move = x - start.X;
int y_move = y - start.Y;
return new Point (x_move, y_move);
}
private void DrawVirtualPosition ()
{
ClearVirtualPosition ();
XplatUI.DrawReversibleRectangle (mdi_container.Handle, virtual_position, 2);
prev_virtual_position = virtual_position;
}
private void ClearVirtualPosition ()
{
if (prev_virtual_position != Rectangle.Empty)
XplatUI.DrawReversibleRectangle (mdi_container.Handle,
prev_virtual_position, 2);
prev_virtual_position = Rectangle.Empty;
}
private FormPos FormPosForCoords (int x, int y)
{
if (y < TitleBarHeight + BorderWidth) {
if (y > BorderWidth && x > BorderWidth &&
x < form.Width - BorderWidth)
return FormPos.TitleBar;
if (x < BorderWidth || (x < 20 && y < BorderWidth))
return FormPos.TopLeft;
if (x > form.Width - BorderWidth ||
(x > form.Width - 20 && y < BorderWidth))
return FormPos.TopRight;
if (y < BorderWidth)
return FormPos.Top;
} else if (y > form.Height - 20) {
if (x < BorderWidth ||
(x < 20 && y > form.Height - BorderWidth))
return FormPos.BottomLeft;
if (x > form.Width - BorderWidth ||
(x > form.Width - 20 &&
y > form.Height - BorderWidth))
return FormPos.BottomRight;
if (y > form.Height - BorderWidth)
return FormPos.Bottom;
} else if (x < BorderWidth) {
return FormPos.Left;
} else if (x > form.Width - BorderWidth) {
return FormPos.Right;
}
return FormPos.None;
}
}
}
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